Data logger



FIG. 1 is a front elevation view of a data logger showing our design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front perspective view thereof.

The broken lines depict portions of the data logger that form no part of the claimed design. 

CLAIM The ornamental design for a data logger, as shown and described. 